Abstract
The first exclusive measurements at CELSIUS-WASA for the double-pionic fusion to d or 3He reveal the ABC effect-a low-mass enhancement in the π π invariant mass spectrum-to be a σ channel phenomenon associated with the formation of a Δ Δ system and combined with a resonance-like behavior in the total cross section. This quasibound system with a mass below the Δ Δ threshold obviously survives also in nuclei as a resonance configuration producing the ABC effect there.
Original language | English |
---|---|
Pages (from-to) | 304-305 |
Number of pages | 2 |
Journal | Progress in Particle and Nuclear Physics |
Volume | 61 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jul 2008 |
Keywords
- Δ Δ system
- ABC effect
- Isoscalar
- p n system
- Resonance